%0 Journal Article %T Effects of superoxide anion on intracellular Ca2+ concentration in rabbit pulmonary arterial smooth muscle cells %A Wang Yi-ping %A Oike Masahiro %A Ito Yushi %J Acta Pharmacologica Sinica %D 2016 %B 2016 %9 %! Effects of superoxide anion on intracellular Ca2+ concentration in rabbit pulmonary arterial smooth muscle cells %K %X AIM: To study the effect of superoxide anion on the Ca2+ homeostasis in smooth muscle cells isolated from the rabbit pulmonary artery. METHODS: Intracellular Ca2+ concentration ([Ca2+]i) was investigated using cell suspension of freshly isolated smooth muscle cells from rabbit pulmonary artery (PASMC). Fura-2 fluorescent ratio obtained at 340 nm and 380 nm wave lengths was measured as an indicator of [Ca2+]i. RESULTS: ATP 30 mumol.L-1 induced a transient increase in the ratio (Ca2+ transient). Thapsigargin, an inhibitor of sarcoplasmic Ca2+ ATPase, induced a phasic increase in the ratio due to Ca2+ leak from intracellular store sites, but not the sustained increase, thereby suggesting the absence of Ca2+ release-activated Ca2+ entry (CRAC) mechanism in PASMC. When PASMC were exposed to superoxide anion by the pretreatment with xanthine and xanthine oxidase (X/XO) for 30 min, sustained component of ATP-induced Ca2+ transient was elevated. The ratios at 5 and 10 min after ATP application (delta ratio5 min and delta ratio10 min) were increased from 0.091 +/- 0.022 to 0.149 +/- 0.048 (P < 0.05) and from 0.021 +/- 0.020 to 0.117 +/- 0.047 (P < 0.01), respectively. But, thapsigargin-induced [Ca2+]i transient was not affected by X/XO. CONCLUSION: Superoxide anion makes ATP-induced Ca2+ transient sluggish, and does not affect Ca2+ leak pathway in PASMC. %U http://www.chinaphar.com/article/view/7358 %V 20 %N 1 %P 10-14 %@ 1745-7254